Honeywell XNX, Technical Manual

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XNX Universal Transmitter
Section 1 - Introduction 14
1.2.3 POD
The POD (
P
ersonality,
O
ptions, and
D
isplay) encloses circuit
boards for the personality module, optional interfaces, and
display�
The personality module, or circuit board, determines the
transmitter behavior based on the sensor type attached to
the transmitter (electrochemical cell, catalytic bead sensor, or
infrared) and provides the necessary interface� Connection to the
attached sensor is made through the sensor connector accessed
via a slot in the POD housing�
The optional communication boards vary depending on the
option selected when ordered� Only one of the three available
interface options (relays, Modbus, or Foundation Fieldbus) can
be attached to the XNX transmitter�
Figure 6. POD, exploded View
1.3 Options
1.3.1 Local HART
Available with any sensor technology or personality, an external
access to the HART interface in the XNX transmitter is provided�
An intrinsically safe (IS) barrier inside the transmitter gives the
user full control using a hand-held interrogator for programming
and configuration� The external interface is installed in the lower
left cable/conduit port of the transmitter and is intrinsically safe�
For more information, see
Appendix A - HART Protocol �
Figure 7. XNX Universal Transmitter with HART Interface IS Barrier
1.3.2 Relays
The relay option (XNX-Relay) provides 3 form “C” (SPDT)
normally open/normally closed (NO/NC) contacts for alarm
and fault indication� A remote reset input is provided (TB4)�
Momentarily closing the the circuit between the pins of TB4
performs the same function as the Reset Alarms & Faults
command�
The XNX transmitter has three relays: relay 1 is for alarm level
1, relay 2 is for alarm level 2, and relay 3 is for faults and special